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US 6,302,321 B1Granted
Sealant layer for container lid
AssigneeSonoco Development, Inc.
InventorsBarry R. Reese, Jeffrey M. Schuetz, Alan D. Williams
Life of this patent
Estimating the term…
Abstract
A sealed composite container for products is provided having a paperboard body ply with a liner ply adhered on the inner surface thereof. One end of the container is rolled outwardly to form a rim and exposing the inner surface of the liner ply. A lid is heat sealed to the rim of the container. The dual-layer sealant composition layer of the lid comprises a base layer, such as high density polyethylene, and an adjacent frangible layer, such as ethylene-methyl acrylate copolymer, the frangible layer being operatively positioned for heat sealing to the rim of the container.
Claims52
A sealed composite container for products, comprising:
- a tubular body member comprising at least one paperboard body ply and having an inner surface;
- a liner ply adhered to the inner surface of said tubular body member and comprising a barrier layer, at least one end of said body member and said liner ply being rolled outwardly to form a rim and exposing said liner ply;
- and
- a lid operatively positioned adjacent to said rim and heat sealed thereto, said lid comprising,
- a barrier layer for preventing the passage of undesirable substances into or out of the container, and
- a dual-layer sealant composition operatively connected to said barrier layer, said sealant composition comprising,
- a base layer, and
- a frangible layer adjacent to said base layer, said frangible layer being positioned so as to face said rim for heat sealing thereto, wherein said frangible layer consists essentially of a polymer selected from the group consisting of ethylene-methyl acrylate copolymers, ionomeric polymers, ethylene-vinyl acetate copolymers, ethylene-methacrylic acid copolymers, and ethylene-acrylic acid copolymers.
5 more elements
A lid for sealing a composite container, comprising:
- a barrier layer for preventing the passage of undesirable substances into or out of the container, and
- a dual-layer sealant composition operatively connected to said barrier layer, said sealant composition comprising a base layer and a frangible layer adjacent to said base layer, said frangible layer being operatively positioned for heat sealing to a container, wherein said frangible layer consists essentially of a polymer selected from the group consisting of ethylene-methyl acrylate copolymers, ionomeric polymers, ethylene-vinyl acetate copolymers, ethylene-methacrylic acid copolymers, and ethylene-acrylic acid copolymers.
A method of manufacturing a lid for sealing a composite container, comprising the steps of:
- providing a support layer substrate having a first surface and a second surface;
- adhering a barrier layer to the first surface of the support layer substrate;
- adhering a paper layer to the exposed surface of the barrier layer;
- and
- adhering a dual-layer sealant composition to the second surface of the support layer substrate, the sealant composition comprising a base layer and an adjacent frangible layer.
2 more elements
A method of manufacturing a sealed container for products comprising:
- providing a tubular member comprising at least one paperboard body ply having an inner surface and a liner ply adhered to the inner surface of the body ply, the liner ply comprising a barrier layer;
- rolling outwardly at least one end of the tubular member to form a rim and expose the liner ply;
- providing a lid for closing the end of said tubular member, the lid comprising a barrier layer and a dual-layer sealant composition, the sealant composition comprising a base layer and an adjacent frangible layer, wherein the frangible layer consists essentially of a polymer selected from the group consisting of ethylene-methyl acrylate copolymers, ionomeric polymers, ethylene-vinyl acetate copolymers, ethylene-methacrylic acid copolymers, and ethylene-acrylic acid copolymers;
- positioning the lid against the rim such that the frangible layer contacts the liner ply;
- heating the sealant composition under conditions sufficient to render at least a portion of the frangible layer of the sealant composition flowable;
- and
- sealing the flowable portion of the frangible layer of the sealant composition to the rim such that the lid is hermetically sealed to the liner ply.
4 more elements
A sealed composite container for products, comprising:
- a tubular body member comprising at least one paperboard body ply and having an inner surface;
- a liner ply adhered to the inner surface of said tubular body member and comprising a barrier layer, at least one end of said body member and said liner ply being rolled outwardly to form a rim and exposing said liner ply;
- and
- a lid operatively positioned adjacent to said rim and heat sealed thereto, said lid comprising,
- a barrier layer for preventing the passage of undesirable substances into or out of the container,
- a kraft paper layer operatively connected to said barrier layer, wherein a surface of said kraft paper layer carries printed indicia, and
- a dual-layer sealant composition operatively connected to said barrier layer, said sealant composition comprising,
- a base layer, and
- a frangible layer adjacent to said base layer, said frangible layer being positioned so as to face said rim for heat sealing thereto.
6 more elements
A method of manufacturing a sealed container for products comprising:
- providing a tubular member comprising at least one paperboard body ply having an inner surface and a liner ply adhered to the inner surface of the body ply, the liner ply comprising a barrier layer;
- rolling outwardly at least one end of the tubular member to form a rim and expose the liner ply;
- providing a lid for closing the end of said tubular member, the lid comprising a barrier layer and a dual-layer sealant composition, the sealant composition comprising a base layer and an adjacent frangible layer;
- positioning the lid against the rim such that the frangible layer contacts the liner ply;
- heating the sealant composition under conditions sufficient to render at least a portion of the frangible layer of the sealant composition flowable;
- pressing the flange and the lid together to preferentially encourage flow of the frangible layer in the direction of the interior of the container to form an inner heat seal bead and an outer heat seal bead, the inner heat seal bead being larger in cross-section than the outer heat seal bead;
- and
- sealing the flowable portion of the frangible layer of the sealant composition to the rim such that the lid is hermetically sealed to the liner ply.
5 more elements
Dependencies are inferred from the claim text.